Tidier way of getting Directory Names only from Blob Container - azure

Question

I am trying to get the directory names only of any directories in a specific location withing Blob Storage
I have the helper class below
public static class BlobHelper
{
private static CloudBlobContainer _cloudBlobContainer;
private const string _containerName = "administrator";
public static void Setup(string connectionString)
{
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString);
CloudBlobClient cloudBlobClient = storageAccount.CreateCloudBlobClient();
_cloudBlobContainer = cloudBlobClient.GetContainerReference(_containerName);
}
public static List<string> GetDirectoryNames(string relativeAddress)
{
var result = new List<string>();
var directory = _cloudBlobContainer.GetDirectoryReference(relativeAddress);
var folders = directory.ListBlobs().OfType<CloudBlobDirectory>();
foreach (var folder in folders)
{
var name = folder.Uri.AbsolutePath;
name = name.Replace(folder.Parent.Prefix, string.Empty)
.Replace(#"/", string.Empty)
.Replace(_containerName, string.Empty);
result.Add(name);
}
}
}
The process to get the directory names only (i.e. not the full hierarchy) feels a bit hacky, although it does work
Is there a better way to do this?
I tried the approach below
var directory = _cloudBlobContainer.GetDirectoryReference(relativeAddress);
var blobs = directory.ListBlobs(true).OfType<CloudBlobDirectory>();;
var blobNames = blobs.OfType<CloudBlockBlob>().Select(b => b.Name).ToList();
return blobNames;
The main difference with the above is the use of UseFlatBlobListing as true
However, this approach results in no folders at all being returned, whereas my other logic does at least give me the 2 folders I expect to find
Any ideas what I am doing wrong?
Cheers
Paul

Answer 1

I suppose your code is OK, I don't understand what you mean "a bit hacky". I think you want to get the directory directly.
Cause no method directory get the directory, for now known method to do it with v11 sdk mostly use the blob uri to do it.
And the below is my way to do it.
CloudBlobContainer cloudBlobContainer = cloudBlobClient.GetContainerReference("test");
BlobContinuationToken blobContinuationToken = null;
var blobsSeg = cloudBlobContainer.ListBlobsSegmented(null, blobContinuationToken);
var directories= blobsSeg.Results.OfType<CloudBlobDirectory>().Select(b => b.Prefix).ToList();
foreach (string directory in directories) {
Console.WriteLine(directory);
}
The result it returns it will be like below pic. Hope this could help you.